I guess the wallet address (14U3v66uuFzVzgaRrvhfcn5pSSxZwRbEff) is not related to any exchange/gambling sites/services base on walletexplorer.com
And the owner of this wallet is only a person since based on the block explorer his transaction was sent out to 999dice.com and poloniex.com. So should forget about this and move forward, serve this as a lesson, if possible make sure you double check and even tripled check the receiving address by looking the 5 character at the beginning and at the end.
better thing to do and besides its your fault not double checking
The address you will be sending,and do you believe that if someones
Recieve the amount you've send and ask him to returns back he will
Do it?i doubt it man.so better let it be and be a lesson for the future
transaction we all deserve for a mistake but if this things happen again
Thats another story